Name: Choice ScarfMoves: Psychic, Aura Sphere, Shadow Ball and ThunderBoltItem: Choice ScarfEVS: 252 Special Attack, 136 Defense and 176 SpeedThis is a highly recommended moveset.Mewtwo needs lots of speed to counter its enemies, So it could just completely defeat any Pokemon really being sent out, watch out for Metagross they are a threat.

Name: All-Out attacker!Moves: Selfdestruct, Psychic, Aura Sphere and Fire BlastItem: Life OrbEVS: 252 Special Attack, 100 Attack and 252 SpeedThis is one hard to kill Pokemon.This moveset will prove how Powerful Mewtwo is. Life Orb will boost his attack making Mewtwo powerful.Psychic Stab will also help it counter its enemies

Final: Mewtwo is a really good Pokemon and its Special Attack is good. Its only bad features are its bad Stab and poor resistances, apart from that. Mewtwo is a fantastic Pokemon and is highly recommended to use in Wi-Fi.